If they're really reputable, contact them direct and ask for the cash price (check). I've done that with a couple of dealers I've done business with for years and it's amazing how much room there is when they don't have to pay ebay, PayPal and the bank 13-15%
In an instance like this when you can reach them outside eBay, I typically send the seller a formal letter through eBay asking if they accept offers. I typically do this before contacting outside of eBay, bc if the answer is yes, you can usually get a little extra off on top of the eBay fees (assuming they're ok with doing a deal outside eBay). Literally just did this tonight with a seller off eBay, worked out for both of us.