My favourite hemp boosters are from easy Peasy nappies - they are Ã‚Â£2 each and I think if you spend over a certain amount the postage is free. HOWEVER, I know when I recommended them to Hannah, they took a really long time to arrive. Although when they did arrive she loved them - so I would still recommend them, but you may want to ask how long delivery will be.
In the meantime you can use microfibre cloths to add a bit of extra absorbency or cheap face cloths. Anything goes really.