Buying used is becoming too risky even on the forums. There are too many people blurring the lines between "new" and "old," mint and good condition, etc. They almost always leave out the date. I saw a guy selling a 2014 Small Box for $2500. Sorry but you can't command a premium price for a 9 year old amp.
You can't buy online because sales tax kills whatever good deals you can find. It's too much risk to buy used online because sellers are becoming more and more dishonest. Recently, Reverb took a month to issue a refund in a case that was clear cut.
Used would be nice but like everything else, a few bad apples come along and ruin things for everyone else, and eventually, everyone else starts taking advantage of the new situation.