I went on both the SNCF ticket site as well as the tgv-europe and it looks like I can print an e ticket from either site. I chose different price tickets to see if that affected being able to print the e ticket and it looked like i would be able to. I thought I had read that you could only print the prem tickets and that the others you had to pick up at the train station. Has that changed?

Do both sites offer Prem tickets?

I'm going to Avignon in October. Do I need to wait 60 days before the trip to purchase the tickets on these sites like I had to for Raileurope?

merci!

It's 90 days for PREM.
If you travel during off peak hours, you can get even cheaper iDTGV (www.iDTGV.com) tickets online on limited number of trains. As of today, the tickets are available up to 9/14.

Prems tickets are usually available 3 months before the travel date.

What's the difference between a TGV and the iDTGV?

It's just a different marketing scheme. IDTGV tickets are only available on the internet. The IDTGV cars are just attached to a normal TGV.