No, I don't know the exact SRP of these figures and neither does Ken. However, here are some suggestions based on past examples.
Both Tour Animal and Adventure Kermit sold for $15.00, so I'd guess Super Grover might go between $15-$20 plus the S&H costs.
If you see these items on eBay, look out for over-inflated prices, me thinks you could make a good judgment call on your own.
As for the conventions, if you live in RI you could make it to WW Philadelphia, but then again it's possible you might not.
There's a way you can avoid the S&H costs on the Super Grover figure once it's made available though but I'm not sure if you'd be willing to pay up for the possibility. Oh no, I'm sorry, got confused myself for a moment.
Lemme explain.
If you can't make it to the conventions, there's another way to get the figures you want to buy. Sign-up for the Palisades Toys' Collector's Club. The initial fee is $50, and if you wait till mid-December you can get one of four different modular introductory kits. Two of these kits will feature Modern Gonzo and GITD Koozbane Kermit. Once you're a member of the club, you can purchase the tour and convention figures from the comfort of your own home.
Hope this helps and have a good day.