Can anyone help me with some translations?

[Rip]

kestovaippa would be likely the most useful term as a search keyword (literally "durable nappy')

(or kestovaippoja (plural partitive form))

[sammy]

Kestovaipat - yes, I presume that would be the usual term for all of the below... but in case you wish to have alternative translations

Washable nappies - pestävät vaipat
reusable nappies - uudelleen käytettävät vaipat
cloth nappies - kangasvaipat
real nappies - (erm what are these? made of nappy-tree bark? )

kertakäyttövaipat would refer to 'ordinary', throwaway/disposable nappies.

[Rosamunda]

There have also been nappy threads here on Finland Forum.

Put diapers into the search engine and you get:
viewtopic.php?f=19&t=37658
Gigi's post at the top of the thread gives several Finnish links

[Littlepants]

This is great! Really helpful. Thank you!
Can anyone tell me if VAT is also written VAT in Finnish?
And how would I say "Best prices guaranteed' and "Made in Europe"

[Rosamunda]

Nope... it's ALV and it's 22%