This was posted on the Money Saving Expert Forum and looks like it could be worth considering, especially if you are just starting out and already eat Kelloggs cereals!
Each packet of promotional cereal is worth 10 points, collect 30 points and you can claim "£43 of veg seeds" just for the cost of p&p of £3.99. There are other things you can use the points for too.
Seeds offerOffer
You get a personalised postal order form. Download and send it off and you will receive £43 worth of seeds from Cottage Garden Seeds, including salads, vegetables and brassicas, for just the cost of postage and package (£3.99). Information about what is included is provided below (there is also a range of other offers which require fewer points).
This reward can only be taken up once and only by one member per household
What seeds are included. SALADS: Mibuna * Mizuna * Green & Red Mustard * Pak Choi * Tah Tsai * Land Cress * Kale Red Russian * Red Chard * Rocket * Corn Salad * Spinach * Sorrel * Chervil * Lettuce Rougette de Montpelier * Chicory Italico Rosso * Rocket Dentellate * Lettuce Lollo Rossa * Lettuce Catalogna Cerbiata * Kale Nero de Toscana * Red Lettuce * Red Comatsura
BASIL: Lemon * Lime * Greek * Cinnamon * Sweet Genovese * Spice * Purple Ruffles * Green Ruffles
ORGANIC VEGTABLES: Early Sprouting Purple Broccoli * Golden Acre Cabbage * Early Nantes Carrots * White Lisbon Onions * Detroit Beetroot * Marvel of Four Seasons Lettuce * Red Cherry Tomatoes * Italian Giant Parsley * Sweet Genovese Basil * Rocket
According to the website you can also get the points from
Andrex
Kelloggs Cereals (FREE cereal promotional packs)
Discovery's fajita and mexican kit boxes with Sol Beer Promotion
Pedigree Pet Foods - (Marley & Me promotional packs)
Andrex
Cadbury's fingers - (packs with the Virgin Vie promotion)
Ryvita's goodness bars
Fabulous Bakin Boys's cupcakes and flapjacks