How to create xsl for best available with best rate?

 This is the xml

<Products><Product><ProductCode>1001</ProductCode><AvailabilityStatus>Available</AvailabilityStatus><TotalPrice>15.000</TotalPrice></Product><Product><ProductCode>1001</ProductCode><AvailabilityStatus>ON-Request</AvailabilityStatus><TotalPrice>10.000</TotalPrice></Product><Product><ProductCode>1002</ProductCode><AvailabilityStatus>ON-Request</AvailabilityStatus><TotalPrice>15.000</TotalPrice></Product><Product><ProductCode>1002</ProductCode><AvailabilityStatus>ON-Request</AvailabilityStatus><TotalPrice>10.000</TotalPrice></Product><Product><ProductCode>1003</ProductCode><AvailabilityStatus>Available</AvailabilityStatus><TotalPrice>15.000</TotalPrice></Product><Product><ProductCode>1003</ProductCode><AvailabilityStatus>Available</AvailabilityStatus><TotalPrice>10.000</TotalPrice></Product></Products>

I need out put like below

<Products><Product><ProductCode>1001</ProductCode><AvailabilityStatus>Available</AvailabilityStatus><TotalPrice>15.000</TotalPrice></Product><Product><ProductCode>1002</ProductCode><AvailabilityStatus>ON-Request</AvailabilityStatus><TotalPrice>10.000</TotalPrice></Product><Product><ProductCode>1003</ProductCode><AvailabilityStatus>Available</AvailabilityStatus><TotalPrice>10.000</TotalPrice></Product></Products>

1. Take only cheap price

2. If product <AvailabilityStatus> is 'Available', take only Available otherwise On-Request

How i write this in xsl 1.0