Garage invoicing software - calling all garage owners!

[Kitchski]

Just wondering if anyone has any recommendations for some basic garage-based SOP software or similar. Looking for something that can book on parts, raise invoices and keep a cashflow record. Using Excel at the moment and although the number of invoices raised each month is fairly low, it's still not ideal. Not looking to invest in something big like Kerridge as financially it's not worth it, but wondered if there were any other basic cheapies floating around?

Cheers in advance to anyone who can help.