I'll be visiting the Netherlands in June, setting out on a tour of the
south from Amsterdam.

I'm told there are cool cycling accessories to buy there. I'd be in the
market for a towable shopping-cart/luggage-cart type thing. I've seen
some on the Internet but the price, well up into the hundreds for the
cart and similarly for the coupler to the bike, seem exorbitant.

Anyone have experience on the terrain?

EFR
Ile de France