How can you say you were conned? You paid for a 64MB SIMM and that is what you purchased. As a buyer you need to know what kind of RAM you need to buy for your specific application. If the seller stated it was 64MB SIMM for a LC-575 then you would have a reason to complain.
For example I got a spare Thinkpad T22 recently and needed RAM for it. I also wanted the biggest SODIMM I can get, which happens to be 256MB LOW DENSITY, 16 chips per module. There are plenty of 256Mb PC100 DIMMs on ebay, most are high density and will not work (but few will even mention density). So what I do is read the advertisements and double check the model number on the SODIMM to make sure it works. Luckily for me somebody was selling a Samsung SODIMM as working in a DELL laptop 128MB but I researched the model number (mostly because the SODIMM looked exactly like a 256MB module) and found out it was a 256MB SODIMM, lucky for me I got it for $6 shipped and it works fine.
Lowendmac.com and some other sites will tell you the limits on RAM and what to look for, it is not that hard to do some research before you get the paypal out and buy something.
For example I got a spare Thinkpad T22 recently and needed RAM for it. I also wanted the biggest SODIMM I can get, which happens to be 256MB LOW DENSITY, 16 chips per module. There are plenty of 256Mb PC100 DIMMs on ebay, most are high density and will not work (but few will even mention density). So what I do is read the advertisements and double check the model number on the SODIMM to make sure it works. Luckily for me somebody was selling a Samsung SODIMM as working in a DELL laptop 128MB but I researched the model number (mostly because the SODIMM looked exactly like a 256MB module) and found out it was a 256MB SODIMM, lucky for me I got it for $6 shipped and it works fine.
Lowendmac.com and some other sites will tell you the limits on RAM and what to look for, it is not that hard to do some research before you get the paypal out and buy something.