Computer fairs are very large market places for second-hand computers, and new or second-hand computer parts. Fairs tend to offer more reasonable prices than high street shops, making them extremely popular ' so get there early.
Computer fairs can offer reduced prices on high street suppliers but beware!!! If you purchase a product which does not work say a motherboard or CD RW you often have to wait until the next fair which maybe a month away then you return the product and then wait another month until they return again. You may be offered a guarentee of an address to return the product if faulty some dealers are genuine and then you have no problems but how do you identify the genuine dealer from the crooks. Best bet is to go for a dealer who has a reputable business and is trading from a premises 5/6 daya per week
Hope this helps