Yeah, you can also buy some bricks or paving stones very cheaply if you need more weight than that (which won't happen very often unless you are making very large cheeses).
People *significantly* overestimate the amount of weight they need on their cheeses. Traditionally Gouda is pressed with only a little more than its own weight. They had wooden molds. You can think of it kind of like an acorn. You have a round shape where the cheese goes in and you have a cap. You put the cap on the cheese, turn the whole thing upside down and then balance it on the handle of the cap. The cap is actually resting loosely on the top, and so when it's upside down, the cap pushes the cheese up to the top of the mold and whey drains out through the gap between the cap and the mold.
Bad ASCII picture:
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Hopefully, you can see the mold on the top on the outside. The cheese in the middle. The cheese is sitting on the lid. The lid is sitting on the handle. The only weight is the weight of the cheese itself and the weight of the mold (which, being made of wood, is not very heavy at all).
Getting the cheese to drain well and to close well, is more about timing than it is about weight. The higher the pH, the easier it is to close the cheese. You also don't want to close it before it has finished draining, so you have to close it slowly. Virtually every recipe that includes weights that I see uses *way* too much weight as far as I can tell. I think it is instructive that Caldwell refuses to give weights in her recipes -- because the amount you press depends on they cheese on the day. A recipe writer can't tell what that should be.