Many people don't mind spending a little extra money on the floor of the house, just because it is done once in a lifetime, or at least once in a very long time. But there are really affordable flooring options out there, and it is a good idea to consider them to find an option that suits your decor ideas.
Vinyl floor tiles are made of soft plastic and they are very cheap. The installation cost is also very low. The cheapest option in vinyl flooring is the usual type. The structured ones are unnecessarily expensive.
If you prefer the look of wood flooring, you can create the same effect with vinyl floorboards. It is almost 75% cheaper and it looks like high quality polished wood.
If you want a floor that is even cheaper you can try wall-to-wall carpets. There are rugs with many different styles and colors out there, and you will surely find one that you will love. Just be careful about the installation price, as it may be higher than the vinyl floor. Ask about prices in advance and see if they fit your budget.
Another alternative is ceramic tile. There are many types of ceramic tiles that can actually be very expensive, but don't let that fool you. There are also types of very affordable ceramic tiles out there.
No matter what you choose in flooring for your house, don't forget that people do not "stare" at the floor (unlike wallpapers and artwork), and the eye actually expects the floor to look pretty fast. And floors can always be complemented with colorful carpets, old carpets and kilims to match the interior of your house.