HPE 3810M to HPE 1950, compatible DACs?

Hi,

I was looking at repurposing some HPE OfficeConnect 1950 switches we recovered from a branch that closed and to uplink them via a DAC/SFP+ to an Aruba 3810M, however, our sales rep is telling me there's no compatible DACs for the 3810 & 1950, and the only way is to do it with SFP+ MMF transceivers (~400$/each) and MMF fiber.... for a total of ~900$ for each connection.

Does anyone have suggestions, even if it's off-brand "compatible" DAC or fiber transceivers that would work with these 2 switches?

Thanks!