No! Bad. 250 euros is the price of a Antminer S5. Find a way to get a S3 for under 100USD. If you pay more, i understand it might be hard if you pay VAT but its not worth it. At all.
If you can get a S5 for 250euros, that would be a good pick, however.
A S3 under 100 usd is quite hard to find tbh. I search and asked at several places.
I agree 100USD is too much, but it is the market which determines the price.
Also consider the 100 price was with BTC around 230. With it going up to around 330's it is bound to go up with it. Just the way the system works. Miners are worth more when BTC has a higher value.
So at this point it is much harder to get 100 dollar S3, but at 230 you could easily find it some with shipping even.