Hi chomper909,
Welcome to the Vodafone eForum - pleased to have you on board!
As pointed out by mr nice, there isn't a way of getting TopUp and Go broadband without purchasing the dongle at the moment. As it's a fairly new initiative for us, there's a chance that this'll change in the future, however at the moment it's simply a case of buying the dongle to obtain the service
For anyone wondering what the service involves, you can find more information by clicking this link -
Vodafone TopUp and Go Broadband.
I trust this answers your query, however let me know if there's anything else you need and I'll do my best to help!
All the best,
MatC
eForum Team