You can purchase these here and they're totally cute but if you can't afford to I think you could also totally DIY this. Just sew a mat like the one in the pic with clips that attached to the arms of a kids sports chair. To sew the mat just use an oil cloth material and bind edges in Fold Over Bias Tape. I bet velcro would also work to attach to arms. You could also ditch the velcro and sew a pocket for the arms to fit into. Also, if your child isn't old enough to not fall out of a chair I would definitely recommend sewing in a three point seat belt system. Here's a harness pattern if you need it. If anyone makes one of these let me know and I'll feature it. Note: Whomever decides to try to recreate this should use their own judgement in terms of safety. I haven't tried to make this. It's just an idea. Be wary of issues with tipping, etc. Probably better for older kids who still need a highchair. Not for an infant. In other words, if you wouldn't put your child in a child's size sports chair, this idea probably isn't for you. Although it looks like the one you can buy is made with a wider base. So if you like this for a younger child, check out the product's website.