internet is the worse place for engines, delivery can double the price and preinspection or returns is difficult. local scrapyards will probably have loads of 1.4s in, i see them all the time. if there's one in that isnt damaged avoid it, its probably in the scrappy coz the engine died or it failed an MOT badly. a niced crashed one, preferably rear impact, is the best bet. if you're very very lucky you'll get to hear the engine running before you buy it, but in scrapyards they rarely keep the keys, and then there's no battery, and some places predrain all fluids.
another option is the adtrader, people list cars breaking in there. you can find an engine with proven history and you can hear it working. and its just as cheap as scrapyards usually.