Advice Needed - Buy or Rent Car for a Month before I start my new job?

I'm debating if we should buy a cheap car around 2000-4000PLN to use for the month and then resell OR if we should rent a car. Lowest I've found so far is 80PLN all-inclusive from LeCar (includes vat, insurance, etc.) I realize buying a used car in Poland is quite an endeavor especially buying it online even if I have someone on the ground can test drive - still I don't want to end up with a bad clutch or tranny which will require money to fix if we decide to visit the seaside for a week. At the same time I have no idea what registration and applicable taxes would run for a car I'd want to drive for a couple months and then resell. I also feel as though dropping 2400 PLN for a month long rental is also a waste but really would like a car before I begin my new job. Any help much appreciated. Cheers,

Residency paperwork will be pretty clear cut (wife has Polish ID card and we both have PL passports). Worst case scenario we have someone in her family register it on their name.

But to be honest - most cars in that price range will have already been destroyed by Polish roads and not worth the hassle. Certainly, anything under 5000PLN is likely to be a bit of a wreck - and it's not easy to find a good second-hand car in Poland.