There are tons of MUS posted on Homeschool Classifieds:
www.homeschoolclassifieds.com
Here are the Delta, Epsilon, & Gamma listings:
MathUSee Delta  $6 ppd. New. test booklet only. kurriculumkorner 06/28 
MathUSee Delta, Gr. 5  $30 ppd. Nice. Teacher, cd,tests. bklefeber1 06/26 
MathUSee Delta  $25 ppd. Nice. DVD, teachers manual and Test booklet. jacquester 05/17 
MathUSee Delta, Gr. 4  $35 ppd. New. DVD, Teacher's Manual, Student Manual, Test Booklet. [more] iamblessed5 07/07 
MathUSee Delta set, Gr. K5  $25 ppd. Nice. TE, DVD. cdfetner 06/29 
MathUSee Delta set, Gr. 4  $30 ppd. Nice. TE, instructor dvd, student test book. hsmom84 05/19 
MathUSee Delta Set: Teacher's Manual, DVD, and  $40 ppd. Partially used Student's Book and Test Book. Email for details.. chicken 06/29 
MathUSee Delta Teacher's Manual & DVD, Gr. 4  $33 ppd. Nice. c2004. mommygk3 07/09 
MathUSee Delta Teachers Manual and DVD, Gr. K5  $25 ppd. Nice. current edition. andreadorr06 05/25 
MathUSee Delta Test Booklet, Gr. 4  $5 ppd. New. Brand new, purchased from Mathusee. my3boysrock 05/11 
MathUSee Delta test booklet, Gr. 4  $6 ppd. New. . mancini 06/04 
MathUSee Delta Test Booklet, Gr. K5  $5. New. Brand new, in perfect conditon.. cherished 06/30 
MathUSee Delta, Teacher Man., & DVD, Gr. 4  $22 ppd. Good. Does not have writing, just shelf wear. dbestfam 06/21 
MathUSee Epsilon  $45. Nice. TM, DVD, Test Booklet, Student Text(18c writen in). momof324365 07/09 
MathUSee Epsilon, Gr. 5  $28 ppd. Nice. . [more] dds 06/11 
MathUSee Epsilon, Gr. 5  $20 ppd. Nice. Teacher's Manual & DVD. Delivery confirmation included. iamblessed5 07/07 
MathUSee Epsilon  $25 ppd. Nice. DVD and teachers manual. jacquester 05/17 
MathUSee Epsilon set, Gr. K5  $25 ppd. Nice. TE, DVD. cdfetner 06/29 
MathUSee Epsilon TE, Gr. 68  $15 ppd. Nice. c 2004 in excellent condition. . opendoorbookstore 07/07 
MathUSee Epsilon TE, Test Book and DVD, Gr. 5  $30 ppd. Good. only test #1 completed. brijenm 05/11 
MathUSee Epsilon Teacher Manuel, DVD, Test Book  $35 ppd. Nice. No Writing or marks. In great condition.. gogreens 06/24 
MathUSee Epsilon Test Booklet, Gr. 7  $8 ppd. New. These are the tests for the Epsilon curriculum. Brand New 2004. wybound 05/23 
MathUSee Epsilon TM, Disc, Set  $25 ppd. Good Condition, Normal Wear, No Writing, nonsmokers. [more] francisandlisa 06/05 
MathUSee Epsilon VHS and Teacher Manual  $25 ppd. Good. . niklon 05/13 
MathUSee Gamma, Gr. 4  $23 ppd. New. Focus: Multiplication; c2004; Teacher Manual and VHS Tape. jcarp 05/16 
MathUSee gamma, Gr. 912  $30 ppd. Nice. DVDs & teachers manual & student test book. cassfamily 05/26 
MathUSee Gamma, Gr. 3  $25 ppd. Nice. Teacher manual and CD; multiplication. mrsrzig 06/18 
MathUSee Gamma, Gr. 4  $30 ppd. Nice. Teacher book, tests, and CD. bklefeber1 06/22 
MathUSee Gamma  $25 ppd. Nice. DVD, Teachers manual and Test Booklet. jacquester 05/17 
MathUSee Gamma, Gr. K5  $30 ppd. Nice. Teacher Manual and DVD. popcorn 06/24 
MathUSee Gamma  $70 ppd. Nice. . [more] heathergolmon 07/03 
MathUSee Gamma, Gr. 4  $30 ppd. Nice. c2004. bbjmom 05/31 
MathUSee Gamma Complete Student & Teacher Set, Gr. 3  $57. Nice. Student Text, Test Booklet, TM, & DVD. No writing/marks! c2004.. nohermanv 07/02 
MathUSee Gamma Teacher Book, DVD, Test Book, Gr. 3  $30 ppd. Nice. DVD/Teacher book in like new condition! No Unit tests.. laurandrew 06/30 
MathUSee Gamma Teacher Manual & DVD, Gr. 3  $20 ppd. Nice. ePrev, combbound TM, can be used w/ current student materials. razorbackmama 07/08 
MathUSee Gamma Teacher Manual & DVD, Gr. 3  $30 ppd. New. Perfect shape, no writing, no marks, not used. weaver7 05/06 
MathUSee Gamma teacher pack(DVD), Gr. 3  $25 ppd. Nice. c2004 can be used with current student book. [more] saxton5family 07/04 
MathUSee Gamma Teacher's Book & DVD set  $25 ppd. Nice. . chicken 06/29 
MathUSee Gamma Teacher's Manual & DVD, Gr. 3  $33 ppd. Nice. c2004. mommygk3 07/09 
MathUSee Gamma test booklet, Gr. 3  $5 ppd. Nice. copyright 2004. tbaldwin35 05/10 
MathUSee Gamma Test Booklet  $6 ppd. Nice. No writing, great shape. jayshelton1 07/06 
MathUSee Gamma Test Booklet, Gr. K5  $5. New. Brand new, in perfect conditon.. cherished 06/30 
MathUSee Gamma Test Booklet  $6 ppd. New. . faithbookingmom 06/24 
MathUSee Gamma TM and DVD  $20 ppd. Nice. No problemsmarks on DVD, but no skipping or anything. 3byzaz 06/29 
