Mina is gonna suck at haggling, I foresee her getting taken advantage off...lolz
Minty will look after her *cuddles*
Just so you know, the models on display are really bad. I mean, in 91 the Nimbus 2000 came out, and the only versions for sale in the shop of the 1000 and the 1500. The 1000 was produced in 67, sooooo I think that's a realistic price for something that old.
Yes, I think we need to stop and do a complete gear-shift mentally with the wizarding world. Forget about muggle economies and cash flow and inflation and consumerism and capitalism and all that fun stuff, I think all that is TOTALLY irrelevant to wizards who have their own economy which is far more static. As Eden says the Nimbus 1000 was first made in 1967 and the 2000 in 1991, presumably the 1500 coming out sometime in the late 1970s or early 1980s. Its not like car manfacturers in our world with an upgraded model every year (and the consumerist hype that makes people want to buy it), the wizarding world is almost medievallly static with little to no advertising, no consumerism and no mass manufacturing. Almost everything is hand-made magically by craftsmen and small shops like Ollivanders have just one outlet in the entire world. Bertie Botts is definitely no Willy Wonka. There's no demand for iPods, iPhones, PCs, washing machines, dishwashers - a wizard or witch simply masters a few spells and their own skill replaces all these mechanical and digital machines. This kind of influence in an economy WOULD turn consumerism on its head - as it has done so in J.K.Rowlings books.
There's no doubt plenty of home-made brooms in the world. How does one value those or their impact on the broom-making industry?
A top quality broom working out at $120 may not seem much to us but most likely that is VERY expensive to wizards and might equate to a top of the range BMW or Audi in the muggle world, despite the apparent exchange rate. On the other hand there might be no meaningful comparison to make at all. Wizards are just different. It might be good to know what the average Ministry clerks wages are though - that might help put broom prices in perspective.
Anyway, readjust your brains. Think possibly renaissance Italy in the 1500s as far as manufacturing, buying and selling. Diagon Alley in the movies looks like a medieval street because basically it is.
I also vote we stick with the canon Galleons, Sickles and Knuts. There's loads of good web resources telling you what each is worth.