Hi Tori,
Orpingtons are lovely,as are most hens,I'm sure you'll enjoy them.I am currently using dust extracted shavings,but,am going to change to the ecopetbed that Tim mentions.When I went to Earthly enterprises web site,they do sell ecopetbed in smaller packs for rats.There was something like 5 of these smaller packs to a box,as I only have 4 ex-battery chickens I don't need large quantities of bedding for their house.
But,when I ring to actually order I will find out the delivery cost and see which will be cheaper for me.
Local stores to me that sell eco type bedding, charge a lot more money for them than shavings,so I think getting it direct from Earthly enterprises will be more economic for me.
Years ago I had a lot of rabbits,and used to buy a bale of hay and also straw from a local stables.This was cheaper than buying large quantities from a pet shop.Unfortunately,I then introduced mites,and the vet bills to treat all the rabbits was very expensive.Worse still,it was a type of mite that can infest dogs,I had 13 dogs at this time,some of which reacted very badly to frontline(vet's favourite mite treatment) so had a very expensive time for a while.Kept expecting the vet to buy a merc,bmw or something

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Anyway,while the bunns were being treated for mites,I kept them on shredded paper,I realise that bunns pee and rabbits don't but I wouldn't recomend shredded paper for any livestock.It was c**p.
I know feed my rabbits only on hay bought from a reputable pet shop(it's pre-treated to prevent mites)and never use straw.My ex batts only have shavings.you may find that although straw looks snuggly and nicer, their droppings may fall/pass through it,making it very smelly/rancid underneath clean looking bedding.
Also,straw will come out on their feet,like shavings and possibly be blown everywhere.I suggest you try the straw,see how it goes,and,if it is impractical for you and your chooks,try some different bedding.
Have you got a camera to post some pics of your chooks when you get them? We'd love to see them

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