This is what I have found from an August 1957 copy of Radio Times;
A 17-inch 'table model' TV (complete with 1950s spiky legs) would have cost 80 guineas � now that was approaching a month's wages for many people (probably more in some cases). Many people in those days rented sets - the rent being something between 10 shillings and a pound a week, depending on the size of the set.
A 2oz (50 gram) chocolate bar cost sixpence.
A manual egg-beater was �1.17.6 (but this was a top-quality make)
Wool (for knitting) was around 1/6 to 2 shillings an ounce.
National Insurance stamps were, for adult (>18) men:
7s5d paid by the employee, the employer paying 6s2d; for women and youths the rates were lower.
Self-employed paid 9s3d, non-employed paid 7s4d.
(These rates applied from 2/9/57).
Orange juice (not squash) at 3/9 a bottle (bottles those days contained around 750ml)
Fly spray, 5/6 for a small aerosol tin.
Shoe polish, 9d a tin
Disinfectant, 1 to 2 shillings per bottle (depending on size)
Ink, usually around 1s6d a bottle (100ml)
Sheds and greenhouses seemed to cost around �15 upwards, and a concrete garage would set you back �50.
Sorry the items are a somewhat strange collection, but that was just what was advertised that week. Try obtaining magazines (particularly women's magazines) for that period for a better feel for prices.