Agree ebay for a lot of stuff, specially if travelling to buy means distance/costs. Local village builders merchant stocks decent shovels/spades (I tend to bend ordinary ones). Wilco's quite good for some stuff as is B&Q for buckets/growbags (can't have enough buckets - can make decent pots out of them too).
For pots and trays i usually cross reference some goodle searches with ebay and buy in bulk... haven't had to buy for 3 years so can;t remember who i used but I was after some huge plastic tubs with handles to transpant the citrus and did find a reasonable price source.
B&Q had soem good lookig blueberries 3 for £10 yesterday.. better quality than wilcos £3 ones (which aren't bad. Wilco also had good looking small fig planst and kiwi as well as currants so i added to my stocks there. Just ordered 9 more currants from j parkers online for £22 delivered..all three colours and claimed 2yrs old with 3+ stems.
I have a theory that if I grow enough the birds might leave me some..