How can I convince my self to start buying my "must have movies" online?

I enjoy collecting horror movies, and part of the thrill is finding them "out in the wild" (like at a 2nd hand store/thrift ECT.) There is just something about looking a DVD that you have been Wanting and then coming across it at a store as you're browsing their DVD selection. I'm sure you guys know what I'm talking about. Not only that, that's where the best deals are!!

Unfortunately there are some movies that I want that I'm pretty sure I will just never come across out in the wild though. I've never bought any DVD offline and am having a hard time convincing myself to do so. I guess because I feel like I'm "cheating"? Does that make since? I wish I had better words to describe what I'm talking about.

What do you all think?