Since my school is switching to Eureka Math instead of Go Math!, I found myself needing a rekenrek. Pinterest is always inspiring.
Here's my version before any paint. It cost about $10 using coupons (of course!).
12x12 unfinished wood frame from Michael's
2 packs of large hole beads from Hobby Lobby
1 pack of wooden dowels (.187 dia)
Hot glue
Easy peasy!