99p in aldi at the mo
others in garden centres from 1.99 to 3.99
no idea if any one of them is better than others - but then i use general multi-purpose compost for everything except the tomatoes

i'll use a couple of growbags on my patio - i'll be tipping the compost from a couple of growbags into 9" pots for tomatoes in the greenhouse - prefer pots to growbags