I'm afraid it doesn't help. "Used" will still be the best way to go.
I used your link and did a search on "home theater". Sorted by price, low to high. The only name I recognize is Phillips, and I'm not sure it's the same company.
I suggest you start searching your sources of used equipment. Let us know what you find that's in your budget. Perhaps somebody here may be familiar with it.
But honestly, you can get a much better stereo system, (2 channel), for your money. And if you're watching on a PC, I suppose you're sitting pretty close to the screen, so 5.1 becomes less important and more difficult.