What are your requirements, besides AVGAS availability? Runway length? Grass runway sufficient? IFR equipped (might be handy, these days)? then EHBK and EHRD are closest, though neither will be much cheaper, I'm afraid.
If not, you could look into Budel EHBD, fairly close.
Could also help by indicating final destination - even Hoogeveen could serve as an alternate, perhaps.
BTW don't forget your first landing should be at a customs a/d, severely limits your options!
PS into their
what have you booked
?