Hello Trevor,
http://test.coingeek.com/exchanges
Remember we discussed how you select an option from first dropdown and the rest dropdown/selections should automatically change so that you do not come to a point where you get no results at all because the combination does not actually exist.

That is happening.

For example if you select Argentina in first drop down and then AUD in second it will give no resutls, because Argentina does not provide any exchanges who allows exchange in AUD.

Is there any way to over come it other than adding custom fields / post meta, because I have several currencies and several countries.

Please let me know if makes sense.

Most Sincerely,
Neha