I crossed from Hungary to Ukraine a few weeks ago, & was only charged 3.00 usd for 2 weeks.
Which seemed abnormally cheap, usually I pay 30 usd a month when I go to UA
(I have been going there the last 4 years)
We crossed at Ipsala 3 years ago and it cost 10 Euros. Very easy, there's an insurance office at the border as I imagine there would be at all the main border crossings.