Hot VWs: just depends on the issues. Normally the 1970s issues sell for around 2-6 $ a piece, the "special interest" issues like the 1970s/1980s "Cal look" ones also can go up to 20-40 $...So it´s hard to tell-but just check out the ebay.com auctions just to get an overview...
The other titles are often not that sought after-but extremely depending on the main topics. If the title story is about "Inch Pincher", you should get a good price
I recently bought a few 1970s issues of Hot VWs via ebay.com (even the one containing the DKP 1 feature as title story and a few "Cal look" issues-but not the legendary Feb 75 one
), and I paid 3 $ in average, the magazines being in very good condition.