Not boasting here but I've scored over 50 centuries and all of them were with a bat that cost less than £200 (so no grade 1+ super fabulous 45mm edge, offset edge, part concaved, with special handle inserts , embossed sparkly stickers, or whatever rubbish is spouted on here) apart from about 6 which I got with a Laver from 2006 to 2008 that I paid just over £200 for.
Apart from the last 2 years all my bats have been bought blind on the Internet or from a sports shop or bat maker based on me saying oval handle 2.10 please.
And not once have I weighed it once I got it but I always got them mid season, knocked them in for 6 months got used to them and only ever used a bat until it was knackered. So maximum I had was 1 useable bat at any time.