Where to buy chemicals in bulk?

I live on the Costa Blanca North and want to buy about 5kg (or more) of sodium bicarbonate (baking soda) and also 2kg of sodium tetraborate.  Local Pharmacia can't help so I wondered if anyone on here knows where I could try please?

I have bought large bag 0f sodium bicarb. in the chinese in the chinese supermarket. Don't know what the other one is

google "lookchem"

The more usual name for tetraborate is Boric Acid

Thanks - sodium tetraborate is Borax (Boric Acid is something else and not what I'm looking for!).

No Chinese supermarkets around here but there might be one in Alicante, which is an hour's drive away.  Am going to google lookchem now!

http://www.amazon.co.uk/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=borax

It''s 'tetraborato de sodio' in Spanish... maybe gaden centres or swimming pool chemical suppliers Carrefour and Aki seem to carry a lot of swimming pool chemicals too...

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Thanks foxbat.  Will give Carefour a try - there's a large one in Benidorm.

I found the stuff on Amazon and eBay - Amazon won't ship this to Spain and the postage charges on eBay are silly - well, 5kg is a lot to send.

If I ever do find a source, will re-post on this board.  Wish me luck.