Courier insurance

[JCKST1]

In the past we have always sold higher value items (£1000 - £5000) and had a insurance policy in place with a £250 excess so when we have had to claim we were able to swallow that excess and it worked out ok.

We are now selling some lower value parts too which range from £70 - £500 and would like them covering, our existing policy wont lower the excess below £250 so anything below that its not worth claiming. Can anyone recommend a broker or company who can help with lower value insurance?