Compost

Bark 40mm
Medium bark is often used under playground equipment. This looks good too when used to finish off the garden & to suppress weeds.

Mushroom Compost
Mushroom Compost is very good for growing tomatoes. (We use it in our glasshouse in the yard for just that).
Roses also like the richness of Mushroom compost.
Keep this away from Rhododendrons though, it is the wrong pH for them.

Pumice
Pumice is useful when propagating & raising seeds as it helps with drainage.

Screened Topsoil
Screened topsoil for planting & top-dressing those lawns.

Pea straw is another product that is useful when mulching gardens. It adds nitrogen to the soil among other goodies as it breaks down. The small bales are kept undercover.