Help get Harry a portable oxygen machine

Hi, my name is Jess and I am fundraising for my little boy Harry. Harry is 4 years old and has NEHI (neuro endocrine hyperplasia of infancy). He relies on overnight oxygen which is provided by a very large and heavy oxygen concentrator which cannot be moved. This means that simple sleep overs at Grandparents are a no, no as it involves being super organised and organising oxygen weeks in advance. I am there looking to raise £2600 to purchase Harry a portable oxygen concentrator which would enable him to have sleepovers at his grandparents and in the future at friends houses with or without me. We would also be to use the portable concentrator for holidays abroad as oxygen is not provided outside the UK and we have to source our own. Many thanks for reading.