Hard drive replacement-- was I ripped off?

I was having problems with my 2008 Macbook Pro, and I took it to a repair shop (not an apple store) to get it checked out. They told me the problem was the hard drive, so I had it replaced . It's since been running perfectly-- the only catch is that my previous hard drive was 180 GB, and the new one is only 80 GB. When I talked to them initially, they told me they were going to put in another 180 GB HD, but they were apparently out of stock and just popped in the 80 GB HD thinking (rightly, I should add) that I wouldn't want to pay a fortune for the huge HDs that they did have in stock. The whole shebang cost me $175 (that includes a new operating system, reinstalled Microsoft Office , added some Adobe software, put my old hard drive in an external enclosure so I could transfer files). The hard drive I thought I was going to get would have cost me $225-- but we're talking more than double the storage capacity. Everything is running smoothly, as requested, but considering they didn't consult me first about the new HD, I felt a little perturbed. Additionally, I just looked up the price of the hard drive they installed (FUJITSU MHY2080BH Media), and found that it is available rather cheaply online (something like 30 bucks). Obviously, there is the repair cost to consider-- but nevertheless, I am not entirely sure where all my money went. Maybe I'm just being paranoid, but can anyone tell me if I am justified in feeling moderately cheated?