Single bed, bunks or high sleeper for 7 year old (New Marston OX3)

We are moving temporarily into an unfurnished property from mid-April until mid August, looking for single bed for my 7yo for this period. Bedframe or bed & mattress, also high sleeper or bunks if that is what you are getting rid of. Will be re-Freegling in August so just a temporary "loan" ;-) We can collect.