Seeing if anyone on the DNM would be interested in Emp jammers aka slot machine jammers, coin machine jammers, fruit machine jammers. Up to date 2014-2015 produced for 300$-350$. Then also EAS jammers, the EAS would be a single model for 300$, possibly a weaker one for $250.
Similar jammers range from $400-600 online, you can find old ones on eBay for my price, but current models are almost double in some places