I don't own this, but I keep trying to figure out an excuse to buy it -

http://www.amazon.com/gp/product/B00125V99S/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER

Perhaps teach the older sibs to crochet so they can help you make those balls? Or use 'granny squares' as manipulatives?

Have you looked at the leapster products?

I wish I had more ideas.

Grinity

Coaching available, at SchoolSuccessSolutions.com