In a comment to a question about setting the parking brake, @rbp said to just get a set of wheel chocks and use those instead. I was piqued - it never occurred to me you'd need your own, I thought they'd be littered around the tarmac for common use - and did a quick Google Shopping search for "aircraft chocks". I was surprised to see a wide price variance, even within a subset of relatively small-size chocks.
For instance, here is a pair of 10" rubber chocks with 3ft rope, about 15 lbs, for \$15. Here is what looks like exactly the same thing, for \$98. Tigerchocks make considerably lighter ones, but they are \$120-ish per chock (over \$200 for any roped pair) while other lightweight designs are as cheap as \$30 for about the same size. Other designs seem to vary between $20-60 for a roped pair, and have noticeable differences in size and design, but c'mon, they're a wedge you put under the tire to stop the plane rolling.
How much of this variance is "you get what you pay for" (more money equals a better product in some way; lighter, grippier, more durable etc) and how much of this is "caveat emptor" (the aviation crowd are used to paying a lot for their gear, so some yahoo with an MBA says "let's see how much we can milk them for a pair of rubber blocks tied with a rope")?