Just got an email from their Reward Zone program - the Eris is on sale for $49.99 with a new 2-year agreement. Same price for new or existing customers. Hope this helps someone!
I got the e-mail too, and as a Silver level Rewards Zone member, I can get the ERIS *FREE* with a 2 year agreement. Or $29.99 for add-a-line, w/ 2 year agreement.