if you look on m and ps website i dont think there are any package prices, but i have latest catalogue and the way i worked it out, was that its basically cheaper for everything if you buy it as a travel system as if you bought individual 2in1/3in1, it works out almost the same price as with it as you get a discount if you buy the carseat together with the puschair
they have these combos hope it helps
*pliko(umbrella)travel pack (includes pushchair, small carrycot, carseat,
raincover,footmuff, and changing bag
£400 which is a much better bargain i than buying things individually
*modo 4in1(includes 2in1 seat unit NO sepearte carrycot, mpx swivel wheel chassis, carseat,a stand to use in carrycot mode, and apron which can be used as footmuff £385
indidvidually these cost seat unit, chassis apron and stand cost £325 and car seat is £110 so its a better deal to buy as a package
*ulima/forme 6in1 same as above but with seprate carrycot £535
individually seatunit,carrycot,stand,apron chassis and carseat is £525 and then carseat is £110
this just gives you an idea but remember the last 2 prams you would need a raincover £30 a bag £50 a footmuff £50 a parasol/canopy £30
theres also the pliko pramette and various 2 in 1s and combos but go online and order a catalogue cheaper than buying one at coop for a £1 coz its free has all options and prices inside
sorry so long hope it helps