B2B Sales information suppliers

[CasioPasio]

Hi,

So long story short I'm looking for suppliers of contacts/leads where I can buy a lot of data in bulk and start making introductions via email and phone.

I've found some websites but I was wondering if anyone has experienced any good suppliers out there.

https://www.marketscan.co.uk/

http://biz-leads.co.uk/

Thanks