If you’ve got your own sing-stake weaves at home, here is a fabulous site that sells weave stakes and weave measures.
You’ll see here they have clip-cups for putting the bars on to also. Check first as it seems most of the accessories will fit 25mm PVC (which you can source at a local hardware store.
I can’t rave enough about Susan Garrett’s 2×2 weave method. You can order the DVD here and she also has a lot of great info on her Blog that answers your questions if training doesn’t progress as you hope.