Not sure about the stores, just ordered mine online. If you go to the site and type in grab bag it should find both and you can see the contents.
"£10 Grab Bag, containing a minimum of £35 of Christmas product:
This consists of: 2 different Ballistics, 2 different Soaps, 2 different Bubble Bars, an Egg Snog Lip Balm OR an Xmas Massage Bar, 1 x 100g Snow Fairy Shower Gel, 1 x 100g Shower Jelly, 1 Tree Amigos or Xmas Party Gift and another Gift worth at least £4.95.
A Grab Bag costing £20, containing a minimum of £80 of Christmas product:
Containing 5 Ballistics, 4 Soaps, 3 Bubble Bars**, an Egg Snog Lip Balm OR an Xmas Massage Bar, 1 Snow Fairy 100g Shower Gel, 2x100g Shower Jellies, a Tree Amigos OR Christmas Party Gift, a Gift worth at least £4.95 and a Christmas Present Gift worth £29.95!"
The christmas present set I think has solid perfume and about 5 other items so with the other items in the bag its a fab bargain.
If you order online, you can change the postage rate as it shows the most expensive version at checkout but easily amended.
Cant wait for mine to arrive, had two of each as I love lush but it is expensive compared to other bath products. Looking forward to trying some new items - not too keen on the soaps but can live with them.