You can pick up kit at low prices in the Classifieds
Just make a thread stating what you want and someone should get back to you.
Goggles are the same as a mask, and there really is no best one to get - Just whichever you find to be most comfortable. Popular ones are the Dye Invision I3's or VForce Profilers, both of which you can get for about £25-30. A cheaper option would be the Dye Invisions - Older than the I3's but you can get them 2nd hand for £15-20.
A thermal lens in your goggles is a must - You really don't want to be steaming up in the middle of a game. All of the goggles stated above should come with a thermal lens so that shouldn't be a problem.
-Will