The most cheap but quality price would be the Orient Vintage. They have variety of prices and the best quality I looked into so far! There are waterproof, hiking and many more types of watches.
Probably would do well with a Timex Scuba Xtreme.
The Timex W-3 is a great water-resistant watch and has a strong warranty in case it does take on water damage under normal use.
you wont get a completely fabulous guitar for under $250, but i would recomend that you try ibanez guitars.
GE makes some very nice and basic wall-mounted clocks with a long battery life.
You can find video cameras under 250$ in any of the main electronic stores like Best Buy. You can also check Amazon's website to compare prices and get the best deal.
a cellphone
Nikon Prostaff is an excellent variable scope for under $250. Excellent optics, can't beat it for the price.
kink, sabrosa, Fit. Co, KHE, GT, We The People, Premium, Eastern. These are good bike brands. From £250+
You can find a Garmin GPS system for under $250. There are many people selling used GPS systems for under $250.
The population of Swiss Military Watch is 250.
You have Penicillin V tablet 125 and 250 mg and Amoxicillin tablet 125/250/500 mg under various brand names in the market. Like Kaypen and Mox respectively in India, for example.
You won't get a good e-guitar for less than £250. I think you should set your budget at at least £250 and maybe aim for an epiphone, takamine etc.