there are a number of suppliers that are good, however thy will sell to trade only so you need to be qualified and show certificates before you will be able to buy from them.
Unless you need to buy something for your couse specifically they should be able to tell you where to get it from. If you want to build up your equipment then I would wait till after your course before you buy them, reason is on the course you will be able to try different equipemnt and see what you get on with best. There is no point buying cuticle knives and finding that you prefer pushers, or curved files and you get on better with diamond or straight. It is hard to tell what you will work better with until you are working with it
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