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The numbers for getDataText are for the series, not the data points.
If you know what the first and last values are of the graph, you could try something like this:
GRAPH FILE CAR
COMPUTE A/D18.2=IF COUNTRY EQ 'ENGLAND' THEN DEALER_COST ELSE -1 ;
COMPUTE B/D18.2=IF COUNTRY EQ 'W GERMANY' THEN DEALER_COST ELSE -1 ;
ON GRAPH PCHOLD FORMAT PNG
ON GRAPH SET HTMLENCODE ON
ON GRAPH SET GRAPHDEFAULT OFF
ON GRAPH SET VZERO OFF
ON GRAPH SET HAXIS 770
ON GRAPH SET VAXIS 405
ON GRAPH SET UNITS PIXELS
ON GRAPH SET LOOKGRAPH VLINE
ON GRAPH SET GRMERGE ADVANCED
ON GRAPH SET GRMULTIGRAPH 0
ON GRAPH SET GRLEGEND 0
ON GRAPH SET GRXAXIS 1
ON GRAPH SET GRAPHSTYLE *
Essentially you can add additional data lines on your graph, and display the data values on those lines. The last 3 graph statements cover up unnecessary data points: