Where would be a good place to get your car weighed? I know the tire psi method, but it's not very accurate.

 

Well, around here I was lucky to find a place where trucks weigh there payload and just drove over it to find my weight.

I don't know if you can find somewhere similar. If your car isn't to heavily modified, I'm pretty sure you can have a good guesstimate of how much it weighs based on what the stock weight is.