There are gift cards that can be loaded and used for online purchases. Like credit cards.
You might look up which ones work for online payment.
You might ask for one of those and order via amazon or directly online.
This way you can order a few items up to the gifted amount.
You might tell that ... that its for a few items you woud like to have.
If they don't agree you might tell you want some FTM equipment that makes you less dysphoric ... have a prepared order ...
and show them the package later as it arrives

*hugs*