For value for money, without compromising quality, consider also PureTone Stethoscopes by DRG/Trimline, Riester models from Germany, and the MDF range.
"May I live simply, that others may simply live" Ghandi
Mindray have Vital Signs Machines (the VS-800) featuring both Masimo or Nellcor as alternatives to their own SpO2, and these are available in the U.S.
They also have economically priced handheld units (PM-50 and PM-60) with a full range of accessories.
AZReam, as a distributor, offers these, together with alternative blood pressure cuffs - both single-patient use / disposable and reusable.
Would this solve the problem?