Alere and Roche also have monitoring services. Roche, for obvoius reasons, uses their CoaguChek meters. They have a meter, called the Vantus, that they send to subscribers. It's pretty limited - it doesn't do prothrombin times (which are pretty irrelevant anyway, because the times are related to the reagent values for the strip being used - so this isn't much information).
But, as Dick suggests, make sure that Medicare will cover the costs of your service - and the amount that you may have to pay for the service.
(FWIW - many of us on this forum own our meters and purchase our supplies. The original PT1 has been selling on eBay, often extremely reasonably. You can probably buy a PT2 online or from a distributor who bundles the meter and strips (one of which used to have a deal where if you buy 3 or 4 boxes of strips, they'll throw in the meter. This is more strips than you need, but you may be able to bring the cost down if you sell an extra box or two) Strips for Coag-Sense range in price (depending on who you buy them from) from about $2 a strip to around $5 a strip.
There are resources here (especially Pellicle) who can help you with self-management.
It may be more affordable to own your meter and self-manage than your deductibles will be if you use a service.