lol no way man! Buy a spoke wrench and learn how to true your wheel! The only question is what size; you could get a 3-way, but those usually really cheap and you might end up rounding off your nipples.

I recommend (a) watch a couple utub videos on how to true a wheel and see how easy it is, and (b) ride to a LBS, tell them you want either a Park SW-40 or SW-42, whichever is the size that fits on your spokes. It'll cost probably about ten bucks.

For a 300lb rider on a bike that accepts max 25/28mm tires, that's a context that is very hard on wheels, so a spoke wrench and a little practice is a good investment. Hopefully you've got at least 32 spokes in the back, 36 would be preferable. Front wheels don't bear as much load, and don't need asymmetric dishing for the cassette, so they are usually less problematic (unless you crash into a curb or something)