Mixing balls and empty bottles

Where is the best place to get these in the UK?

I'm planning to try some spectraflair and would like to decant polish to try rather than stuff up a whole bottle!
Plus I think I really really need those little balls for mixing - both my planned frankens and a few old bottles that need a vigorous shake1!

Aren't the balls just small steel ball bearings? You can get those on ebay pretty cheap.

I don't know about bottles though

I got bottles and ball bearings from eBay. It was a while ago though so I don't have the sellers names any more.

I just bought lots of cheapies from bodycare and poundland. It was cheaper than buying empties from eBay. I saved my top coat/ base coat bottles as well as they run out fastest. Got my ball bearings from a cycle place on eBay, about £2 with p&p

My local Bodycare had bottles of wet and wild for 29p each. They had the bearings in them

Thanks for all the suggestions. all depends on how the spectraflair purchase (see the other thread) goes!