@Amberlilly - did you type the whole phrase ‘gifts under £5’ into the Folksy search box?
Because I just did that and so I get every listing that contains the words ‘gift’, ‘under’, the number ‘5’ and the ‘£’ symbol. So you can in theory get a listing that has a title of ‘Offer - 5 Cats Under Bridge gifts brooches for just £40’. The listing would be £40 but the search has correctly identified there were the words ‘gifts’, ‘under’ ‘5’ and ‘£’ within it.
Typing any phrase into the search engine box only matches items that have the same words as the phrase you have input, it doesn’t sort out the gifts into a price hierarchy. So it doesn’t think to itself, 'I’ll search for ‘gifts’ and then order the listings so that the ones for £5 and under appear first, because in computer language the search box can only deal with one instruction (find this phrase) and not two separate steps (firstly- find this phrase and then secondly - sort into numerical order).
The only way you can achieve what I think you are after, is I guess to type the word ‘gift’ into the search box, and then click the left hand navigation, under the heading Price, and the option ‘Under £5’. You should then get about 7k worth of gift suggestions all under the monetary price of £5.
Hope that helps.