You can open an account with FIG and trade high yield bonds....

You can open an account with FIG and trade high yield bonds. However there are some limitations to trading online.
One being a minimum balance of $250k . This is to deal in retail bonds only.
The majority of high yield bonds are available to sophisticated investors only.
You need to be registered as such . Some of the qualifications include having $2 million in clear cash assets plus various declarations from your accountant. The main idea of holding bonds is to obtain a constant income flow.
If you are saving cash you are doing something right so keep at it.