Hiya
First off please do not buy from a petshop, there are an estimated 33,000 buns in rescues young, middle aged and old desperate for homes, all of my buns are rescues (i have lots of pic thread if you want to look!) you can have a look here too
Rabbit Rehome - Adopt an unwanted bunny from a rescue centre if you see a pair of rabbits out of your area the members on the forum will help to do a 'bunnyrun' which means people will do parts of the journey to get your bun/buns closer to you.
They are quite expensive pets, I buy bales of hay from horse shops becasue i have room to store it, so it only costs me £5 a month ( i use alot of hay) plus i buy a bale of readigrass from the horse shop that cost about £10 but lasts months. Toys.... well ive bought loads

lol food about £15 month for 2 rabbits.
If you adopt the buns from a good rescue they should be vacc'd and neutered already which saves you alot of hassle and money, the average adoption fee is £40 each rabbit and that covers both. When you break it down Myxi vacc every 6 months costs £20, vhd £11 at my vets each rabbit. Neutering at my vets who are very experienced with rabbits and keep them overnight is £85 for female and £65 for male.
You are much better of getting a male/female bun already neutered if you want to bond them. Rescues will bond them for you too as its quite time consuming and scary bonding buns!! Unless you want to adopt and already bonded pair.
Housing depends on whether they are house buns or outdoor buns, outdoor buns need a min 6ftx2ftx2ft hutch for average size buns, and they need a decent size run for about 7 hours in the day out of their hutch. Alot of people use shed/converted playhouses. This is prob the most expensive bit to pay for!
I have 4 rescues and they are worth every penny to me

they need lots of time with you too to be nice socialable buns.
My buns are insured with the NFU about £5 a month each i think.