I bought some HP printer ink cartridges through the "shop for spares" app on my printer driver - once you place your order you get several choices of supplier. I went for Shima Uma, slightly nervously because I'd never used them before, because they were one of the lowest priced, not quite the lowest, but they promised genuine HP cartridges. I think I had to pay a delivery fee, but even with that they were still cheaper than many of the others. And even though I ordered late in the day, the cartridges turned up within two days. Excellent service.
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