I would say it depends on your final destination. There are a couple of small Belgian fields nearby, and you could stop for customs at Ostend EBOS or Antwerp EBAW, and then fly on to EBWE (check whether they are open on Monday). With the 75 gallons in the Bonanza, one fuel stop (e.g. on the way back) should suffice.
The Netherlands (and especially medium sized airports like Eindhoven) tend to mark things up pretty stiffly and recently taxes have gone up too. It is seen as an elitist venture and is generally discouraged. [The Netherlands were the ones who were adamant about implementing the mode S-transponder, even though ATC couldn't cope]
There also is Budel, which is nearby and probably cheaper. I believe they have customs on request (because they do business charters), but better check with them.
Kempen Airport: Contact / openingstijden
Then again, if you're final destination is a visit to the Philips factories or something in Eindhoven, I'm afraid paying up at Eindhoven is probably your best bet. A taxi-ride from Weelde and back quickly eats up the difference in fees.
The cheapest way to combine things might be to fly into EBAW and rent a car at the airport. Eindhoven is then a 1 hour drive.
Does this help ?
PP.