An eBay experience

I elected to purchase the rebuild kit (piston & rings, gaskets, rod etc.) from eBay -- I found the best price there and figured it's time to try eBay out. The Kohler-genuine rebuild kit was about $200 online (this would have been factory-original parts, my first choice) and the local small engine shop would sell an after market kit for the same. On eBay I found one for $105US; after shipping and currency conversion it ended up being about $140 Canadian.
The eBay seller uses a "blanket" item number for the K301 engine's kit -- you need to use eBay 'messaging' to contact the seller after the sale to let them know the exact overbore size and rod size that you need. Sounds simple. I made the purchase as a 'guest' (didn't want to sign up) but they don't tell you that you can't sign in to the message service with a guest account, you need a full account. Argh. They'd beaten me, so I signed up. Then you find out that the message service is disabled for 3 days after initial sign-up, so I couldn't reply to the seller with the details. What fun.